how easy is it to edit information that is on there? Is it like a wiki where we can just change things using a browser or do we have to check-in/out files. I'm asking since there is a lot of information on the discussion site which kind of gets buried but should ideally be in some FAQ or in the OpenFOAM documentation.

Yup just like that.
Can you write an article on how to import source to the subversion repository please (or just put a link in)?
Also, if possible, could you e-mail me and mattijs the admin password so we can start customising a bit?

We also need to establish some kind of categorisation so we can lock the front page. Suggestions on this structure welcome.